[inspector] Build inspector under v8_enable_inspector build flag.

src/inspector/V8Debugger.h

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_INSPECTOR_V8DEBUGGER_H_
 #define V8_INSPECTOR_V8DEBUGGER_H_
 
 #include "src/inspector/Allocator.h"
 #include "src/inspector/JavaScriptCallFrame.h"
 #include "src/inspector/V8DebuggerScript.h"
 #include "src/inspector/protocol/Forward.h"
 #include "src/inspector/protocol/Runtime.h"
-#include "src/inspector/public/StringView.h"
-#include "src/inspector/public/V8ContextInfo.h"
 
-#include <v8-debug.h>
-#include <v8.h>
+#include "include/v8-debug.h"
+#include "include/v8-inspector.h"
+
 #include <vector>
 
 namespace v8_inspector {
 
 struct ScriptBreakpoint;
 class V8DebuggerAgentImpl;
 class V8InspectorImpl;
 class V8StackTraceImpl;
 
 using protocol::ErrorString;
@@ skipping 122 matching lines @@
   protocol::HashSet<void*> m_recurringTasks;
   int m_maxAsyncCallStackDepth;
   std::vector<void*> m_currentTasks;
   std::vector<std::unique_ptr<V8StackTraceImpl>> m_currentStacks;
   protocol::HashMap<V8DebuggerAgentImpl*, int> m_maxAsyncCallStackDepthMap;
 };
 
 }  // namespace v8_inspector
 
 #endif  // V8_INSPECTOR_V8DEBUGGER_H_